EP 0248295 B1 19901024 - METHOD AND APPARATUS FOR PRODUCING A WELD JOINT IN THERMOPLASTIC STRAP
Title (en)
METHOD AND APPARATUS FOR PRODUCING A WELD JOINT IN THERMOPLASTIC STRAP
Publication
Application
Priority
US 87169386 A 19860606
Abstract (en)
[origin: US4776905A] A method and apparatus is provided for securing together overlapping portions of a thermoplastic strap loop around an object. The overlapping strap portions are forced together in face-to-face contact under pressure. During or before the step of forcing the strap portions together, the energy in the strap portions is increased so as to melt at least a part of the thickness of each strap portion at the interface region. One embodiment of the method also includes forming a plurality of cavities that are distributed across the width of the molten parts adjacent the ends of the molten parts and that are surrounded by the molten parts. The step of increasing the energy is then terminated, and the strap portions at the interface region subsequently solidify, to encapsulate the cavities and form the welded joint. In another, and preferred, embodiment of the invention, the pressure on the strap portions is released while the parts of the strap portions are molten (whether or not cavities are present), and the strap portions at the interface region subsequently solidify in the absence of pressure.
IPC 1-7
IPC 8 full level
B29C 65/02 (2006.01); B29C 65/06 (2006.01); B29C 65/08 (2006.01); B65B 13/32 (2006.01)
CPC (source: EP US)
B29C 65/0618 (2013.01 - EP US); B29C 66/1122 (2013.01 - EP US); B29C 66/4322 (2013.01 - EP US); B29C 66/4324 (2013.01 - EP US); B29C 66/49 (2013.01 - EP US); B29C 66/73921 (2013.01 - EP US); B29C 66/81433 (2013.01 - EP US); B29C 66/8322 (2013.01 - EP US); B65B 13/322 (2013.01 - EP US); B29C 65/08 (2013.01 - EP); B29C 66/71 (2013.01 - EP US); B29C 66/8242 (2013.01 - EP US); B29C 66/9241 (2013.01 - EP US); B29C 66/929 (2013.01 - EP US); B29C 66/944 (2013.01 - EP US); B29C 66/9513 (2013.01 - EP US); B29C 66/9517 (2013.01 - EP US); B29C 66/954 (2013.01 - EP US); B29L 2031/7276 (2013.01 - EP); Y10T 156/1028 (2015.01 - EP US)
C-Set (source: EP US)
Designated contracting state (EPC)
CH DE FR GB IT LI SE
DOCDB simple family (publication)
US 4776905 A 19881011; AU 593333 B2 19900208; AU 7007687 A 19871210; CA 1270432 A 19900619; DE 3765699 D1 19901129; EP 0248295 A2 19871209; EP 0248295 A3 19880831; EP 0248295 B1 19901024; FI 872538 A0 19870605; FI 872538 A 19871207; JP S62287811 A 19871214; KR 880000222 A 19880324; NO 872377 D0 19870605; NO 872377 L 19871207; NZ 219807 A 19890106
DOCDB simple family (application)
US 87169386 A 19860606; AU 7007687 A 19870317; CA 537824 A 19870525; DE 3765699 T 19870522; EP 87107510 A 19870522; FI 872538 A 19870605; JP 13906587 A 19870604; KR 870005691 A 19870605; NO 872377 A 19870605; NZ 21980787 A 19870330